Plumbing fitting



FIG. 1 is a perspective view showing the inside of the plumbing fitting of this invention;

FIG. 2 front view of the plumbing fitting of FIG. 1;

FIG. 3 is a side view showing the plumbing fitting of FIG. 2, with the opposing side view being the mirror image thereof; and,

FIG. 4 is a s a top view of FIG. 3. 

The ornamental design for a plumbing fitting, as shown and described. 